“…These articles have provided an outline of the principles for production, and decay considerations for therapeutic radionuclides (Volkert et al, 1991), clarified the relationships between tumor size and curability for therapy with beta-emitting radionuclides (Wheldon, 1994;O'Donoghue et al, 1995), and set the criteria for the selection of radionuclides for cancer radioimmunotherapy . A recent review describes the developments in the application of therapeutic radiopharmaceuticals in preclinical studies, as well as in the clinical setting (Ercan and Caglar, 2000;Srivastava, 2002). Nuclear medicine has indeed experienced a resurgence of interest in radiotherapeutic procedures.…”